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Studies of low-lying states of even-even Xe isotopes within the nucleon pair approximation

Science china(Physics,Mechanics & Astronomy) 2011年第S1期54卷 103-108页

作者： ZHANG LiHua1, JIANG Hui1,2 & ZHAO YuMin1,3,4 1Institute of Nuclear, Particle, Astrophysics and Cosmology, Department of Physics, shanghai Jiao Tong university, shanghai 200240, china 2school of arts and sciences, shanghai maritime university, shanghai 200135, china 3Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator, Lanzhou 730000, china 4CCAST, World Laboratory, P.O. Box 8730, Beijing 100080, china shanghai Jiao Tong university Institute of Nuclear Particle Astrophysics and Cosmology Department of Physics Shanghai China (GRID:grid.16821.3c) (ISNI:***) shanghai Jiao Tong university Institute of Nuclear Particle Astrophysics and Cosmology Department of Physics Shanghai China (GRID:grid.16821.3c) (ISNI:***) shanghai maritime university School of Arts and Sciences Shanghai China (GRID:grid.412518.b) (ISNI:***) shanghai Jiao Tong university Institute of Nuclear Particle Astrophysics and Cosmology Department of Physics Shanghai China (GRID:grid.16821.3c) (ISNI:***) National Laboratory of Heavy Ion Accelerator Center of Theoretical Nuclear Physics Lanzhou China (GRID:grid.450259.f) (ISNI:0000 0004 1804 2516) CCAST World Laboratory Beijing China (GRID:grid.464262.0) (ISNI:0000 0001 0318 1175)

We study the relevance of nucleon pairs with higher spins, in addition to spin-zero and spin-two pairs (i.e., S D pairs), in low-lying states of even-even Xe nuclei. By including those higher-spin pairs in our configuration, we recalculate energy level schemes, elec trical quadrupole moments, magnetic moments and electric quadrupole transition rates, for low-lying states of even-even 128-142Xe nuclei. The agreement between our calculated results and the experimental data is substantially improved in comparison with previous studies.

关键词： nucleon pair approximation shell model configuration space low-lying states

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Parametric estimation of discretely sampled Gamma-OU processes

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Science china Mathematics 2006年第9期49卷 1231-1257页

作者： ZHANG Shibin,ZHANG Xinsheng & SUN Shuguang school of Management, Fudan university, shanghai 200433, china Department of Mathematics, shanghai maritime university, shanghai 200135, china school of Management Fudan University Shanghai China Department of Mathematics Shanghai Maritime University Shanghai China

The stationary Gamma-OU processes are recommended to be the volatility of the financial assets. A parametric estimation for the Gamma-OU processes based on the discrete observations is considered in this paper. The estimator of an intensity parameter A and its convergence result are given, and the simulations show that the estimation is quite accurate. Assuming that the parameter A is estimated, the maximum likelihood estimation of shape parameter c and scale parameter a, whose likelihood function is not explicitly computable, is considered. By means of the Gaver-Stehfest algorithm, we construct an explicit sequence of approximations to the likelihood function and show that it converges the true (but unkown) one. Maximizing the sequence results in an estimator that converges to the true maximum likelihood estimator and the approximation shares the asymptotic properties of the true maximum likelihood estimator. Some simulation experiments reveal that this method is still quite accurate in most of rational situations for the background of volatility.

关键词： Gamma-OU process transition function Lévy process Lévy density stochastic volatility background driving Lévy process Laplace transformation maximum likelihood estimation

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ON THE COHOMOLOGY OF GENERALIZED RESTRICTED LIE ALGEBRAS

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Chinese Annals of Mathematics,Series B 1998年第4期19卷 421-432页

作者： SHU BIN (Institute of Applied Mathematics & Physics, shanghai maritime university, shanghai 200135, china.) Institute of Applied Mathematics and Physics Shanghai Maritime University Shanghai 200135 China

In [21], generalized restricted Lie algebras, defined over a field F of positive characteristic p, were introduced. In this note their cohomology, especially the so-called generalized restricted cohomology is studies. Some reduction properties are obtained. For graded Cartan type Lie algebras the author determines the first Lie-cohomology groups and the first generalized restricted cohomology groups with the coefficients in the highest weight modules from which all irreducible generalized restricted modules are derived.

关键词： Generalized restricted Lie algebras Generalized restricted Cohomology Lie algebras of Cartan type

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Combinatorial Model Involving Stochastic Choices of Destination, Mode and Route

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Journal of shanghai university(English Edition) 2001年第2期5卷 171-176页

作者： ZHOU Xi zhao Management school, shanghai maritime university, shanghai 200135, china Management school Shanghai Maritime University Shanghai China

Traffic assignment models are one of the basic tools for the analysis and design of transportation systems. However, the existing models have some defects. Considering the characteristics of Chinese urban mixed traffic and the randomness of transportation information, the author develops a combinatorial model involving stochastic choices of destination, mode and route. Its uniqueness and equivalance are also proved by the optimization theory.

关键词： destination choice mode choice route choice

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Simple generalized restricted modules for graded Lie algebras of Cartan type

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Chinese Science Bulletin 1998年第16期43卷 1336-1340页

作者： SHU Bin Institute of Applied Mathematics & Physics, shanghai maritime university, shanghai 200135, china Institute of Applied Mathematics & Physics Shanghai Maritime University Shanghai China

Let %L=X(m:n) (2), X∈{W,S,H,K}% be a simple graded Lie algebra of Cartan type over a field %F% of characteristic p>3. With the aid of Farnsteiner’s generalized reduced Verma module, a connection between the simple G... 详细信息

关键词： Lie algebra of Cartan type generalized restricted module generalized reduced Verma module.

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Conjugation in Representations of the Zassenhaus Algebra

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Acta Mathematica Sinica,English Series 2001年第2期17卷 319-326页

作者： Bin SHU Institute of Applied Mathematics & Physics. shanghai maritime university. shanghai 200135, P. R. china Institute of Applied Mathematics & Physics Shanghai Maritime University Shanghai 200135 P. R. China

Let F be an algebracially closed field of characteristic p>2, and L be the pn-dimensional Zassenhaus algebra with the maximal invariant subalgebra L0 and the standard filtration {Li}|i=-1pn-2. Then the number of isomorphism classes of simple L-modules is equal to that of simple L0-modules, corresponding to an arbitrary character of L except when its height is biggest. As to the number corresponding to the exception there was an earlier result saying that it is not bigger than pn.

关键词： Zassenhaus algebras (Cartan-type Lie algebras) Simple modules of Lie algebras and their isomorphism classes

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A Study on the Loss of Profit from Logistics Outsourcing

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上海海事大学学报 2004年第2期25卷 172-174页

作者： QU Lin - chi(school of Economics & Management, shanghai maritime university, shanghai 200135, china) school of Economics&Management Shanghai Maritime UniversityShanghai200135China

This paper discusses the possible loss of profit from logistics outsourcing in terms of transaction costs, non - intemalization of externality, inefficient allocation of inputs, and double price - cost mark - ups. The... 详细信息

关键词： logisdcs outsourcing information industrial organization

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Impact of Sophisticated Stationary Forecast Techniques on the Bullwhip Effect in a Supply Chain

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Journal of shanghai Jiaotong university(Science) 2007年第5期12卷 665-672页

作者：汪传旭 school of Economy and Management Shanghai Maritime Univ.

The bullwhip effect in a multistage supply chain was analyzed using sophisticated stationary forecasts (third order moving average and third order exponential smoothing forecasts). The third order exponential smoothing and third order moving average forecasts sometimes have a variance reducing effect on the supply *** a supply chain with positively correlated or independent and identically distributed (i.i.d) demands, the order variance based on simple moving average forecast (or simple exponential smoothing forecast) is larger than the order variance based on second order moving average forecast (or second order exponential smoothing forecast),and the order variance based on second order moving average forecast( or second order exponential smoothing forecast) is larger than the order variance based on third order moving average forecast( or third order exponential smoothing forecast). In addition, for i.i.d demands, third order exponential smoothing forecast leads to a larger variation than third order moving average forecast.

关键词： supply chain management bullwhip effect forecasting third order moving average third order exponential smoothing

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Logistics Network Design for Manufacturing Enterprises with Component Processing Workshops

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Wuhan university Journal of Natural sciences 2010年第6期15卷 516-520页

作者： DING Yizhong Logistics Research Center,shanghai maritime university,shanghai 200135,china Logistics Research Center Shanghai Maritime University Shanghai China

Logistics network design influences the efficiency and cost of Logistics *** manufacturing enterprises not only have warehouse hubs,but also build component processing workshops which are usually located in those places where the costs of materials and workforce are *** paper establishes a logistics network design model for the manufacturing enterprises with component processing workshops based on 0-1 mixture integer *** model optimizes the logistics network in an integrated view,by which the selection of the nodes,the manufacturing plan,and transportation plan can be *** example is given to verify its *** approach is helpful for designing of the logistics network in manufacturing enterprises.

关键词： manufacturing enterprise logistics network component processing 0-1 mixture integer programming

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Computational model for perception of objects and motions

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Science china(Life sciences) 2008年第6期51卷 526-536页

作者： YANG WenLu1,2, ZHANG LiQing1 & MA LiBo1 1 Department of Computer Science and Engineering, shanghai Jiao Tong university, shanghai 200240, china 2 Department of Electronic Engineering, shanghai maritime university, shanghai 200135, china Department of Computer Science and Engineering Shanghai Jiao Tong University Shanghai China Department of Electronic Engineering Shanghai Maritime University Shanghai China

Perception of objects and motions in the visual scene is one of the basic problems in the visual system. There exist 'What' and 'Where' pathways in the superior visual cortex, starting from the simple cells in the primary visual cortex. The former is able to perceive objects such as forms, color, and texture, and the latter perceives 'where', for example, velocity and direction of spatial movement of objects. This paper explores brain-like computational architectures of visual information processing. We propose a visual perceptual model and computational mechanism for training the perceptual model. The compu- tational model is a three-layer network. The first layer is the input layer which is used to receive the stimuli from natural environments. The second layer is designed for representing the internal neural information. The connections between the first layer and the second layer, called the receptive fields of neurons, are self-adaptively learned based on principle of sparse neural representation. To this end, we introduce Kullback-Leibler divergence as the measure of independence between neural responses and derive the learning algorithm based on minimizing the cost function. The proposed algorithm is applied to train the basis functions, namely receptive fields, which are localized, oriented, and bandpassed. The resultant receptive fields of neurons in the second layer have the characteristics resembling that of simple cells in the primary visual cortex. Based on these basis functions, we further construct the third layer for perception of what and where in the superior visual cortex. The proposed model is able to perceive objects and their motions with a high accuracy and strong robustness against additive noise. Computer simulation results in the final section show the feasibility of the proposed perceptual model and high efficiency of the learning algorithm.

关键词： visual perception visual cortex computational model receptive fields simple cells complex cells

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